The use of an acousto-optic modulator in a ring laser to enforce unidirectional and hence single-frequency operation has been extended to the 1.3-μm lines in Nd:YAG. We have also been able to obtain stable simultaneous operation on a single frequency in each of the 1.319 and 1.338-μm transitions either cw or Q switched. The mechanism behind this behavior is described, and implications for other laser systems are discussed. When the laser is operated single frequency, as much as 155 mW of cw output is produced, and 30-μJ, 40-ns, Q-switched pulses have been obtained.
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Neilson et al. (1993) studied this question.
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